Appendix
48 Installation and maintenance instructions ecoTEC plus 0020209591_01
Code Meaning Cause
F.49 Fault: eBUS Short circuit on eBUS, eBUS overload or two power supplies with differ-
ent polarities on the eBUS
F.52 Contact fault mass flow sensor/Venturi The mass flow sensor/Venturi is not connected electrically
– The plug is not plugged in correctly
– The plug is not plugged in
– The plug is defective
– The slot is defective (loose connection)
– Mass flow sensor/Venturi defective
F.53 Combustion regulation fault The combustion regulation has detected a fault
– Gas flow pressure too low
– Liquid gas coding resistance used when operating with natural gas
– If the fault occurs again after being cleared:
– Gas valve defective
– Mass flow sensor/Venturi defective, wet or blocked (if the fault
occurs again after being cleared): Do not wet the sensor, do not
use any lubricants on the O-ring on the Venturi.
F.54 Fault in the gas supply (in combination with
F.28/F.29)
There is insufficient gas supply to operate the unit
– Gas isolator cock(s) closed
– Gas flow pressure is too low
– Gas valve defective
F.56 Combustion component fault A component in the combustion regulation is defective
– Contact fault at the gas valve (plug not plugged in correctly or not
plugged in, plug defective, slot is defective (loose connection))
– Natural gas coding resistance used when operating with liquid gas
– If the fault occurs again after being cleared: The gas valve is defect-
ive
F.57 End comfort protection mode Active comfort protection mode has detected a regulation fault
– Ignition electrode highly corroded
F.61 Gas valve actuation fault The gas valve cannot be actuated
– Cable harness supply line to the gas valve is defective (short to
earth, short circuit)
– Gas valve defective
– PCB defective
F.62 Gas valve switch-off delay Delayed shutdown of gas valve detected
– Secondary light (ignition and monitoring electrode indicates delayed
extinguishing of the flame signal)
– Gas valve defective
– PCB defective
F.63 Fault: EEPROM Electronics defective
F.64 Fault: Electronics/NTC Flow or return NTC short circuited, electronics defective
F.65 Fault: Electronics temp. Electronics overheating due to external influences, electronics defective
F.67 Fault: Electronics/flame Implausible flame signal, electronics defective
F.68 Fault: Unstable flame signal Air in gas, gas flow pressure too low, incorrect air ratio, condensate
duct blocked, incorrect gas restrictor, ionisation flow interruption (cable,
electrode), flue gas recirculation, condensate duct
F.70 Invalid device specific number (DSN) If spare parts fitted: Display and PCB replaced at same time and DSN
not reset, incorrect or missing output range coding resistance
F.71 Flow NTC fault Flow temperature sensor signalling constant value:
– Flow temperature sensor incorrectly positioned at supply pipe
– Flow temperature sensor defective
F.72 Flow/return NTC fault Flow/return NTC temperature difference too great → flow and/or return
temperature sensor defective
F.73 Water pressure sensor signal in the wrong
range (too low)
Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pressure
sensor defective
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